Construction Materials, Methods and Techniques (MindTap Course List)
4th Edition
ISBN: 9781305086272
Author: William P. Spence, Eva Kultermann
Publisher: Cengage Learning
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Question
Chapter 18, Problem 1RQ
To determine
The difference between coniferous tree and a deciduous tree.
Expert Solution & Answer
Answer to Problem 1RQ
The difference between them is that coniferous trees are softwood whereas, deciduous trees are hardwood.
Explanation of Solution
Wood is a natural organic material and is a unique among construction materials as it is renewable. Woods are mainly categorized into softwoods and hardwoods. Coniferous trees are softwood which bears cones with a few exceptions having a needle like leaves. Deciduous trees are hardwood having bread leaves and they shed their leaves during winter.
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Q.1 select the lightest W12 shape for column AB that support a service
dead and live loads Po-150k and P-200k as shown in Figure. The
beams and columns are oriented about the major axis and the
columns are braced at top and mid-height using pinned end
connections for out of plane buckling. ASTM A992 steel is used. Select
the suitable answer below:
I
U
B
W18.76
8.00
All dimensions in feet
30.00
8091
B
P
Consider the structure shown in (Figure 1). Suppose that
F = 2500 N.
Figure
0.2 m
1500 N
0.2 m
30%
0.2 m
B
-0.2 m-0.2 m-
F
Part A
Determine the resultant couple moment.
Express your answer to three significant figures and include the appropriate units. Enter positive value if the moment is
counterclockwise and negative value if the moment is clockwise.
ΜΑ
?
1 of 1
MR = 2.85
kN⚫m
√30°
1500 N
AUG
16
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A
W
20
Aa
Example
The 30-N force P is applied perpendicular to the
portion BC of the bent bar. Determine the moment
of P about point B and about point A.
Ans: Mb= 48 N.m
Ma= 81.941 N.m
P = 30 N
1.6 m
45°
B
1.6 m
Chapter 18 Solutions
Construction Materials, Methods and Techniques (MindTap Course List)
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